Fix WASM browser: broken links (&rest bytecode) + broken reactive counter (ListRef mutation)

Two bugs fixed:

1. Links: bytecode compiler doesn't handle &rest params — treats them as
   positional, so (first rest) gets a raw string instead of a list.
   Replaced &rest with explicit optional params in all bytecode-compiled
   web SX files (dom-query, dom-add-listener, browser-push-state, etc.).
   The VM already pads missing args with Nil.

2. Reactive counter: signal-remove-sub! used (filter ...) which returns
   immutable List, but signal-add-sub! uses (append!) which only mutates
   ListRef. Subscribers silently vanished after first effect re-run.
   Fixed by adding remove! primitive that mutates ListRef in-place.

Also:
- Added evalVM API to WASM kernel (compile + run through bytecode VM)
- Added scope tracing (scope-push!/pop!/peek/context instrumentation)
- Added Playwright reactive mode for debugging island signal/DOM state
- Replaced cek-call with direct calls in core-signals.sx effect/computed
- Recompiled all 23 bytecode modules

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

shared/static/wasm/sx/dom.sx

@@ -9,13 +9,11 @@
 (define
   dom-create-element
   (fn
-    (tag &rest ns-arg)
-    (let
-      ((ns (if (and ns-arg (not (empty? ns-arg))) (first ns-arg) nil)))
-      (if
-        ns
-        (host-call (dom-document) "createElementNS" ns tag)
-        (host-call (dom-document) "createElement" tag)))))
+    (tag ns)
+    (if
+      ns
+      (host-call (dom-document) "createElementNS" ns tag)
+      (host-call (dom-document) "createElement" tag))))
 
 (define
   create-text-node
@@ -128,11 +126,11 @@
 (define
   dom-query
   (fn
-    (root-or-sel &rest rest)
+    (root-or-sel sel)
     (if
-      (empty? rest)
+      (nil? sel)
       (host-call (dom-document) "querySelector" root-or-sel)
-      (host-call root-or-sel "querySelector" (first rest)))))
+      (host-call root-or-sel "querySelector" sel))))
 
 (define
   dom-query-all
@@ -342,12 +340,12 @@
 (define
   dom-add-listener
   (fn
-    (el event-name handler &rest opts)
+    (el event-name handler opts)
     (let
       ((cb (host-callback handler)))
       (if
-        (and opts (not (empty? opts)))
-        (host-call el "addEventListener" event-name cb (first opts))
+        opts
+        (host-call el "addEventListener" event-name cb opts)
         (host-call el "addEventListener" event-name cb))
       (fn () (host-call el "removeEventListener" event-name cb)))))